4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 as published by
6 * the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 #include <linux/init.h>
20 #include <linux/module.h>
21 #include <linux/crypto.h>
22 #include <linux/vmalloc.h>
24 #include <linux/lzo.h>
25 #include <crypto/internal/scompress.h>
31 static void *lzo_alloc_ctx(struct crypto_scomp *tfm)
35 ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
37 return ERR_PTR(-ENOMEM);
42 static int lzo_init(struct crypto_tfm *tfm)
44 struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
46 ctx->lzo_comp_mem = lzo_alloc_ctx(NULL);
47 if (IS_ERR(ctx->lzo_comp_mem))
53 static void lzo_free_ctx(struct crypto_scomp *tfm, void *ctx)
58 static void lzo_exit(struct crypto_tfm *tfm)
60 struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
62 lzo_free_ctx(NULL, ctx->lzo_comp_mem);
65 static int __lzo_compress(const u8 *src, unsigned int slen,
66 u8 *dst, unsigned int *dlen, void *ctx)
68 size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
71 err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx);
80 static int lzo_compress(struct crypto_tfm *tfm, const u8 *src,
81 unsigned int slen, u8 *dst, unsigned int *dlen)
83 struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
85 return __lzo_compress(src, slen, dst, dlen, ctx->lzo_comp_mem);
88 static int lzo_scompress(struct crypto_scomp *tfm, const u8 *src,
89 unsigned int slen, u8 *dst, unsigned int *dlen,
92 return __lzo_compress(src, slen, dst, dlen, ctx);
95 static int __lzo_decompress(const u8 *src, unsigned int slen,
96 u8 *dst, unsigned int *dlen)
99 size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
101 err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
110 static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src,
111 unsigned int slen, u8 *dst, unsigned int *dlen)
113 return __lzo_decompress(src, slen, dst, dlen);
116 static int lzo_sdecompress(struct crypto_scomp *tfm, const u8 *src,
117 unsigned int slen, u8 *dst, unsigned int *dlen,
120 return __lzo_decompress(src, slen, dst, dlen);
123 static struct crypto_alg alg = {
125 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
126 .cra_ctxsize = sizeof(struct lzo_ctx),
127 .cra_module = THIS_MODULE,
128 .cra_init = lzo_init,
129 .cra_exit = lzo_exit,
130 .cra_u = { .compress = {
131 .coa_compress = lzo_compress,
132 .coa_decompress = lzo_decompress } }
135 static struct scomp_alg scomp = {
136 .alloc_ctx = lzo_alloc_ctx,
137 .free_ctx = lzo_free_ctx,
138 .compress = lzo_scompress,
139 .decompress = lzo_sdecompress,
142 .cra_driver_name = "lzo-scomp",
143 .cra_module = THIS_MODULE,
147 static int __init lzo_mod_init(void)
151 ret = crypto_register_alg(&alg);
155 ret = crypto_register_scomp(&scomp);
157 crypto_unregister_alg(&alg);
164 static void __exit lzo_mod_fini(void)
166 crypto_unregister_alg(&alg);
167 crypto_unregister_scomp(&scomp);
170 module_init(lzo_mod_init);
171 module_exit(lzo_mod_fini);
173 MODULE_LICENSE("GPL");
174 MODULE_DESCRIPTION("LZO Compression Algorithm");
175 MODULE_ALIAS_CRYPTO("lzo");